We show the effects of hole shape, size, and periodicity variation on extraordinary transmission through a tuned
metamaterial of 4 pairs of alternating layers of Ag-Al2O3 with 20 nm thicknesses under illumination of TM light.
The advantage of a metamaterial over a Ag film of similar thickness is the tunability of the surface plasmons
coupling k-vector. Because their cross sections appear the same in fourier space, incident TM light sees the
same structure for circular, square, and rectangular holes transmission is unaffected by these shape variations.
Further, as we increase the hole size, the transmission does not exhibit the expected enhancement as both the
250 nm and 150 nm diameter holes are both too small to have their maxima overlap with the tuned transmission
enhancement of the metamaterial. For the metamaterial, we are able to tune it to support surface plasmons
from periodicities ranging from 130 nm to 215 nm, which effectively shifts the transmission peaks from the blue
end of the spectrum in Ag films across the visible and into the red.
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